Han may refer to: People Ethnic groups Han Chinese, or Han people (), the largest ethnic group in China Han Taiwanese (), the ethnic group of Taiwanese people who are fully or partially of Han Chin
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dfca9a5c27d4c362444c37d63dee85ecd1b27ab9e1e5c537b4b423652ee7682. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b0f26fb7-8799-4ca1-a4f1-06a363eae53d.json and https://artists.proofprofile.net/proofs/artist/b0f26fb7-8799-4ca1-a4f1-06a363eae53d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).